Study on the Dynamic Combustion Characteristics of a Staged High-Temperature Rise Combustor

Meng Li, Jinhu Yang (), Cunxi Liu, Fuqiang Liu, Kaixing Wang, Changlong Ruan, Yong Mu and Gang Xu
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Meng Li: Fluid Machinery Engineering Technology Research Center, Jiangsu University, Zhenjiang 212013, China
Jinhu Yang: Qingdao Aeronautical Technology Research Institute, Qingdao 266000, China
Cunxi Liu: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Fuqiang Liu: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Kaixing Wang: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Changlong Ruan: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Yong Mu: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Gang Xu: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2025, vol. 18, issue 3, 1-20

Abstract: Currently, steady-state analysis predominates in combustion chamber design, while dynamic combustion characteristics remain underexplored, and there is a lack of a comprehensive index system to assess dynamic combustion behavior. This study conducts a numerical simulation of the dynamic characteristics of the combustion chamber, employing a method combining large eddy simulation (LES) and Flamelet Generated Manifold (FGM). The inlet air temperature, air flow rate, and fuel flow rate were varied by 1%, 2%, and 3%, respectively, with a pulsation period of 0.008 s. The effects of nine different inlet parameter pulsations on both time-averaged and instantaneous combustion performance were analyzed and compared to benchmark conditions. The results indicate that small pulsations in the inlet parameters have minimal impact on the steady-state time-averaged performance. In the region near the cyclone outlet, which corresponds to the flame root area, pronounced unsteady flame characteristics were observed. Fluctuations in inlet parameters led to an increase in temperature fluctuations near the flame root. Analysis of the outlet temperature results for each operating condition reveals that inlet parameter fluctuations can mitigate the inherent combustion instability of the combustion chamber and reduce temperature fluctuations at the outlet hot spot.

Keywords: large eddy simulation; staged combustion chamber; dynamic combustion characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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